Cell phone charger repair
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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Currently, our market has a large selection of Chinese-made electronic devices. These products are characterized by low price and, as a result, low reliability. As a rule, electrical circuits are missing, which makes repairs difficult.
The author had to repair a charger (charger) for a cell phone worth 180 rubles, which failed 1 second after being plugged into the network. The device is placed in a plastic case with a power plug. The charger is connected to a cell phone by a cord with a connector at the end. The diagram of the device is shown in the figure. The numbering of parts - the author.
The basis of the memory is a switching power supply. The maximum output voltage is 12 V, the maximum output current in the operating mode is 0,5 A. Some functions of the charger are performed by the cell phone itself, for example, it determines the moment when charging is completed.
In a faulty memory, transistors VT1, VT2, VT3 were broken and resistor R1 was cut off. The breakdown of the VT3 transistor occurred, most likely, due to moisture condensation under the case cover during storage, since the soldering points on the board are not varnished, and the distance between the contact pads of the drain and the VT3 gate is no more than 1,5 mm.
Transistor VT3 was replaced by IRFBE30, VT1 - by KT209A. The board was covered with several layers of zapon varnish. It is advisable to drill several holes in the case cover opposite the VT3 transistor, since it is installed without a heat sink.
After repair, the charger is successfully used to charge a battery of three nickel-cadmium batteries in an Ericsson cell phone.
Author: A. Panshin, Moscow
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